When the Trojan is executed, it creates the following mutex to ensure that only one copy of the threat is running on the computer:
Next, the Trojan copies itself to the following location and appends a random amount of data to the file in order to have a random size:
It checks for the presence of the following firewall programs:
If present, the threat copies itself to the %System% folder but postpones its malicious activity until the computer restarts.
It then gathers the following information from the compromised computer:
- OS version
- Presence of Service Pack 2
- Language of the system
It creates the following folder with system and hidden attributes:
The Trojan then creates the following file, which is used to save gathered information:
It also creates the following file, which is used to store the encrypted configuration of the Trojan:
Next, the Trojan modifies the following registry entry so that it executes whenever Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\"Userinit" = "%System%\userinit.exe, %System%\ntos.exe"
It may also create the following registry entries so that it executes whenever Windows starts:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\"userinit" = "%System%\ntos.exe"
HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Run\"userinit" = "%System%\ntos.exe"
Next, it injects malicious code into the following running processes:
The Trojan attempts to create malicious threads in all running processes except for the following one:
The injected code will prevent the removal of the Trojan by blocking access to deletion of all of the malicious files and by regenerating all of the registry subkeys associated with the Trojan when they are deleted.
The Trojan then hooks certain system functions using usermode rootkit techniques to ensure that its code gets injected into each process.
The Trojan attempts to gain control of network functionalities and to steal sensitive information.
The Trojan may perform the following actions:
- Intercept network traffic
- Redirect traffic
Next, it may add the following registry entry as an infection marker for the compromised computer:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network\"UID" = "[COMPUTER NAME]_[UNIQUE ID]"
The Trojan then opens a back door on TCP Port 6081.
If the system date is after July 10, 2007, it starts the encryption routine of files present on the computer.
It creates the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"WinCode" = "[ENCRYPTION KEY]"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\"Win32" = "[MAIL FLAG VALUE]"
[ENCRYPTION KEY] is a random generated unique 4-bytes key for the specific compromised computer.
[MAIL FLAG VALUE] is a random chosen number between 1 and 4 used to select the email address of the attacker.
Next, it scans for files on all drives from A through W, excluding CD-ROM drives and the root of drives. If a drive is found, it searches sequentially by two drive letters for the next drive. For example, if drive C is not a CD-ROM drive, it searches drive E for files.
The Trojan searches for files with the following extensions:
When a file is found, the Trojan encrypts it with a custom encryption algorithm by using the generated key. The first bytes of the encrypted files contain the string "GLAMOUR" followed by the encrypted data.
Next, the Trojan creates the following file in each folder where a file has been encrypted:
The file contains the following message:
Hello, your files are encrypted with RSA-4096 algorithm ([http://]en.wikipedia.org/wiki/R[REMOVED]).
You will need at least few years to decrypt these files without our software.
All your private information for last 3 months were collected and sent to us.
To decrypt your files you need to buy our software. The price is $300.
To buy our software please contact us at: [MAIL ADDRESS] and provide us your personal code [PERSONAL CODE].
After successful purchase we will send your decrypting tool, and your private information
will be deleted from our system.
If you will not contact us until 07/15/2007 your private information will be shared and you will lost all your data.
[MAIL ADDRESS] is one the following email addresses chosen according to the [MAIL FLAG VALUE] number:
[PERSONAL CODE] is a decimal number converted from the [ENCRYPTION KEY] value.
The Trojan attempts to send and receive data from the following remote host:
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":